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W. B. LUCE. ELECTRIC ARC LAMP.

Patented Sept. 12, 1893.

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W B LUCE ELECTRIC ARG LAMP.

N5. 505,051. 415.155155 sept. 12, 1893.

UNITED STATES PATENT OEEECE.

WILLIAM B. LUOE, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR OF ONE- THIRD TO EDWARD S. RITOHIE da SONS, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 505,051, dated September 12, 1893.

Application filed December 5, 1892. Serial No. 454,113. (No model.)

To a/ZZ whom it may concern:

Be it known that I, WILLIAM B. LUCE, of Brookline, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Electric- Arc Lamps, of which the following is a specification. A

This invention relates to electric arc lam ps, and has for its object to improve the construction of the same. One feature of my present invention consists in a clutch mechanism, of novel construction as will be described, by which the feed of the upper carbon is controlled.

Another feature of my invention consists in a novel construction of globe or shade holder, whereby the globe or shade may be lowered away from the lamp frame to permit the globe to be readily removed, and also to permit of free access to the carbon pencils, whereby the latter may be more easily and quickly renewed.

The particular features in which my invention consists will be pointed out in the claims at the end of this specification.

Figure l represents an electric arc lamp embodying my invention, the frame for the lamp being omitted; Fig. 2, a longitudinal section, through the lifting magnet, showing the clutch mechanism in position to permit the upper carbon to feed downward; Fig. 3 a detail in elevation of my improved form of clutch; Fig. 4, a sectional detail on the line 4. 4., Fig. 3; Fig. 5, a sectional detail on the line 5 5 Fig. 3; Fig. 6, a detail to be referred to; Fig. 7, a detail in elevation, partially broken out, of the lower portion of the lamp `frame showing the globe holderin its normal or elevated position; Fig. 8, a detail in elevation of the lower portion of the lamp frame showing lthe globe in its lowered position.

Referring to Fig. l, A represents a solenoid of any usual or well-known construction, through which is extended, the carbon holder o for the upper carbon o,the latter being secured to its holder as by a clamping screw CL2.

The carbon holder o has co-operating with it, a clutch mechanism of special construction, as will now be described. The clutch mechanism referred to, consists essentially of a ring or band o4, pivotally connected,

as by screws or pivots o5 to the upper end of a magnetic core composed of two parts or members, one part or member being prefer 'ably made as a substantially semi-circular tube o6, secured at its lower end, as herein shown, by screws @33 to a guiding collar or ring o7, through which the carbon-h older o, is extended. The clamping ring o4 has secured to it, as by screws o9, the other member or part of the magnetic core which is preferably a bar or piece om of iron, preferably made to conform to the cylindrical shape of the tube CLG, to cooperate with the said tube to complete the same. The bar or strip 0,10 has secured to its lower end, a stud or projection @12 inserted into a hole or opening ot13 (see Fig. 6) in a cross bar a, having secured to it, arms a o16 pivotally connected, as at o, als to a cross bar or rod o, herein shown as supported by an adj usting screw d20, on a threaded rod @21, the latter being extended through a suitable hole or opening in the cross bar al. The core as shown in Fig. l, is supported upon a spring @22, which in practice, encircles the carbon holder a, and rests upon a cross bar o23 secured to the solenoid A by the threaded rod @21 and the rod om. The upper carbon a cooperates with the usual lower carbon b. When the lamp is not in operation and the carbons ot b are in contact7 the clutch mechanism occupies the position shown in Fig. 2, the bar am, at such time being moved inward or toward the tube ce by the weight of core on the cross-bar 0.14, and the spiral spring L22 is, at such time, depressed. When the lamp is not in operation, the bar d10 is in a substantially vertical plane, as represented in Fig. 2, and at such time, the pivoted clutch ring has been turned on its pivots a5, so as to be withdrawn from engagement with the carbon holder 0,. -When the current is supplied to the solenoid A, the magnetic core, consisting of the tube o and the part om, is attracted up within the solenoid A, and the part d10, being movable and similarly magnetized to the part d6 is repelled at the same time by the part c6, thereby tilting the clutch ring a4 on its pivots o5 and causing the said ring to bind on the carbon holder at diametrically opposite upper and lower points of the ring,there by iirmly grasping the carbon holder c and lifting the latter upward to establish the arc between the carbons. When the arc becomes abnormal the current is shunted through the high resistance coil of the solenoid A and the attractive force of the main coil of the solenoid is diminished, thereby permitting the part d10 of the clutch to be removed by the weight of the cross bar aw toward the other part of the core, which movement tilts the clutch ring back to its normal position and permits the carbon to `feed down.

In connection with the lamp, shown in Fig. l, I have represented an automatic cut out, which may be of any usual or well-known construction, it being shown as consisting ot an electro-magnet b3 b4, the coil bof the electro magnet being of high resistance, and the coil b" being of substantially low resistance; the coil b4 having one of its wires, as b5, joined to the positive binding post b6 ot' the lamp and the other end of its coil bi', joined to the front stop bs for the armature b9, the said ar mature being connected through the resistance R to the negative binding post bloot the lamp. The coil b3 has one of its wires, as Z912, connected to the positive binding post b and its other wire D13 joined to the high resistance shunt coil of the solenoid A; the other end of the high resistance coil being connected to the negative binding post b1@ by wire Z214. The positive binding post b is connected by wire Z215 with one end of the low resistance coil of the solenoid, the other end of the low resistance coil being connected by wire b1@ to a brush I)17 normally in contact with the carbon holder a, the lower carbon holder b being connected by wire c to the negative binding post blo. The lower carbon holder c, in accordance with my invention, is supported in a cross bar c2, secured to the tubular rods c3 c1 forming part of the frame for the lamp. The tubular rods c3 cl have extended into them guide rods c5 e6, having secured to them a cross bar cT to which is pivotally secured, as by screws c3, a globe holding base c, provided with the usual lugs or uprights c10 and set screws cl2. The globe holding base c9 is detachably secured to the carbon holding bar c2, by means of two uprights C13 c, having slots or openings C15 adapted to engage suitable locking projections or lugs c16 ou the opposite sides of the cross bar c2. The guide rods c5 c6 are provided at their upper ends with suitable enlargements or caps c1T (see Fig. 7) by which the downward movement of the globe holding base is limited. In the normal condition of the lamp, the globe holding base c9 is firmly locked to the cross-bar c2 as represented in Fig. 7, but when it is desired to remove the globe for any purpose, or when it is desired to renew the carbons and especially the lower carbon b, the globe holding base o9 may be turned on its pivot cs, so as to disengage the slotted uprights cl3, c11 from the locking lugs cw, and when thus disengaged, the said base may be lowered into the position shown in Fig. 8, leaving the lower carbon b readily accessible.

l claiml. In an electric arc lamp, the combination ofthe followinginstrumentalities, viz: a solenoid, a carbon holder extended therethrough, and a magnetic core consisting of two parts or members, one part or member being movable longitudinally within the solenoid and the other member being movable longitudinally and laterally, and a clutch ring pivoted to the iirst member and operated by the lateral movement of the second member to grasp the carbon holder, substantially as described.

2. In an electric arc lamp, the combination of the following instrumentalities, viz. a solenoid, a carbon holder extended therethrough, and a magnetic core consisting of two parts or members,one part or member being movable longitudinally within the solenoid, and the other member being movable longitudinally and laterally, a clutch ring pivoted to the first member and operated by the lateral movement ot the second member to grasp the carbon holder, and means to act on the laterally moving member to turn the clutch ring torelease the carbon holder, substantially as described.

3. In an electric arc lamp, the combination of the following instrumentalities, viz. asolenoid, a carbon holder extended therethrough, and a clutch mechanism to operate on the carbon holder consisting of a tube or shell a, a clutch ring pivoted thereto, and a magnetic bar or piece aw, secured to the said ring and adapted to tilt the ring on its pivot to clutch the carbon holder, substantially as described.

4. In an electric arc lamp, the combination of a carbon holder for the lower carbon b, a supporting bar c2 for the said carbon holder, tubes c3 c4 secured to the said support, guide rods c5 c6 movable in the said tubes, a cross bar connecting said guide rods and a globe holding base pivotally secured to the said cross bar, and means to lock the said base to the support for the lower carbons, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 2d day ot' December, A. D. 1892.

WILLIAM B. LUCE.

Witnesses:

C. F. BROWN, A. D. HARRISON.

ICO 

